• Only compatible with COROS Heart Rate Monitor
• Material: polyester fiber, nylon, spandex
• Arm Size (Standard): 7.09-12.6 inches (18-32cm)
• Arm Size (Large): 9.4-16.9 inches (24-43cm)
• Snug and easy fit for enhanced heart rate accuracy
• Breathable and comfortable during long workouts
• "EXPLORE PERFECTION" included on the band